MAL-2026-12233

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/tinkoff-boxy-independent-kasko-form/MAL-2026-12233.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12233
Published
2026-08-05T09:04:10Z
Modified
2026-08-05T10:06:36.209170890Z
Summary
Malicious code in tinkoff-boxy-independent-kasko-form (npm)
Details

-= Per source details. Do not edit below this line.=-

Source: amazon-inspector (873f98d16d6e9c4ecb2f5919621cfa940fe0059c48de29b1bb0eff6420527afc)

On require of the package, index.js loads bootstrap.js which reconstructs hardcoded hostnames via split-string.join obfuscation and downloads a platform-specific binary from Cloudflare Workers subdomains (oob-worker.cf101-adf.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf102-baf.workers.dev). If HTTPS mirrors fail, resolveDns() reads a chunk count from c.<domain> TXT records and fetches base64-encoded payload chunks from N.tin.dl.well1.site TXT records, reassembling them into an executable. The payload is written to /tmp or %TEMP% under disguised filenames (.cache<hex>, dotnetdiag<hex>.exe), chmod 0755, and spawned detached via cp.spawn("/bin/sh", ["-c", filePath + " &"]) or cmd equivalent on Windows. The package name references an unrelated 'kasko form' library, unrelated to the dropper behavior. lib/telemetry.js ships a second copy of the same drop-and-exec logic under an 'analytics SDK' cover story.

Database specific 
{
    "malicious-packages-origins": [
        {
            "import_time": "2026-08-05T09:28:22.641510359Z",
            "versions": [
                "20.1.3"
            ],
            "modified_time": "2026-08-05T09:04:10Z",
            "source": "amazon-inspector",
            "sha256": "873f98d16d6e9c4ecb2f5919621cfa940fe0059c48de29b1bb0eff6420527afc",
            "id": "IN-MAL-2026-014531"
        }
    ]
}
References
Credits

Affected packages

npm / tinkoff-boxy-independent-kasko-form

Package

Name
tinkoff-boxy-independent-kasko-form
View open source insights on deps.dev
Purl
pkg:npm/tinkoff-boxy-independent-kasko-form

Affected ranges

Affected versions

20.*
20.1.3

Database specific

indicators 
{
    "evidence_files": [
        {
            "path": "_bootstrap.js",
            "sha256": "1a9c70ce3e5628d44b68dc24981123d0a85ba669622da060d0a06b9ad94ef02d",
            "tlsh": "a8a1b79a12a570198b70dbe4c7178826f66af6633381c2c0f79c59944f736248371efc"
        },
        {
            "tlsh": "18834055566a242186b2b368df234107ff3685272643429dbafc82dc1fbd72092a5ffc",
            "sha256": "912fb5e84544b5d2e801283de9f9d30e4c5bc3377d936141a751eb6b6ca52ee7",
            "path": "lib/telemetry.js"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha1": "f73cf59673345595cc6b3a3465152a3077868922",
                "sha512_sri": "sha512-SnvG+C8CVgHbYx2OOVRCeUtH+vcUNfWrMNFRKLrzdMyojEb07x8d670/GTkGrXAZczsSzx04XOLJTTDTmyE2PQ=="
            },
            "filename": "tinkoff-boxy-independent-kasko-form-20.1.3.tgz"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/tinkoff-boxy-independent-kasko-form/MAL-2026-12233.json"
cwes 
[
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    }
]